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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b606ecab2709c70ba947518d1d2580beec019ed81b14084744e4d8de838659c2' 
  AND token = '7x5CIyKA5lGVqmWlokNnD5O05fobGMJKgPOi+L1s5uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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