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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbedc71927e757af636441c25ba65dcf8ca15857c1d2d7b0a4ad09654d452d33' 
  AND token = 'ngBh/W2tdb/8YEqIK0LdS9xDHVeV0dWZkyqJedhJ+wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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