SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '043cad59a08b6afa33fd22888ecf7df1b862b6c2a8c38db6059573d87d9c2b63' 
  AND token = 'Y7AQZmFOqlGGS9LmFiBlqrCZO/WG94ldawJwBErd9gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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