SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011133d024c6b32e937951ad9e37fa688caf9df173fc50b501f2f08b87de2088' 
  AND token = 'IHvhO7Zx+Wi6SibhscJgMe2WuzQ0/FZEMJyqyyUYEUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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