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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8838348de04ca22988dec850c57fda28be45406c58c447c80388a7e3790cb671' 
  AND token = 'ZIkHJOCYoax2RmSzKu58BZ4Fa7wRHiUClU9d4mIUJws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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