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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c69d4b7162a9ff92f68f7225fdc9a48844ac1a8e5e1f963ee966196ffd2867' 
  AND token = 'f9u8/nB/uoyTeZqPn0W2FSQZxOfJqF2QHg9pmJ/CsWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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