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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e83f07759c92a05b821c1c1f59d684b1ace9c9df2da0b979e6f00633b37e87' 
  AND token = 'H8d7qFVpDx5gx2QpRW5SPD1RbP0NqtHunIzF52SsFv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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