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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e71bb34f7e21d652f7b949f3fb63c9fc4b542e3e5341cb2faf3f003c36093df' 
  AND token = '9zCF/iJcLpKAKWp1Ar7ZOGI7U+Eik8oRzUZaPLEPns8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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