SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a5490dba6dc07d4487f35669a4333245908feb1f50d7cbbdad348f9a7bf97d' 
  AND token = 'akNSqFNwuFlal0skmltGdXnTPnJZz+UbV/Lo4Dub/yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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