SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6271b153933b1ea3c6ab126bc9600930a4fd44aaf59c1e75af0db256115d4ad8' 
  AND token = 'AgeSIBFlFv8RQSIhULN7xuCRGqkjbLK3Px8zvwZF0Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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