SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd93fd6f3047b6e3396a8413cd54de0cd06d43e0685b1b08d9f58ce79b9969072' 
  AND token = '1fz+13ELBZrK2afHi21QVxDkHlPjC/KsCC5G+HHJZOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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