SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9592c883d0c50703ac32b4acbcb861916d85fefce603b3cc81ef37dcaebd47a' 
  AND token = '26zvuNnROhHGtYnZVQmB6Jp93dzvQb5PeOW+JeNYWCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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