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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2679c962d7ff1b18ed4e2ccaaa50e5fe0da8e3123384ab5e98031ec4938a7d78' 
  AND token = 'K+AjZTLO852Di+KdN/p42+sXk/iVYt8b+icjijNUurA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}