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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c913f6bdfa8b185e4accd995c9f1a1eff31940efcd811db9ee2786ed12ee8caa' 
  AND token = 'mv9oQkkGpDxqswR+ShDdSbuRaOZ/pqefRo7uKXNYTz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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