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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5bee0434e1d486716b9be621e27642a285f434a38c304d6f63209c948880550' 
  AND token = 'Id8un/2dKFgoT6okj2zZiC01Xaai3UhmjvptNQPj9X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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