SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e089de49a32b0c9ef243591bfd46816ae842368fdecffad279617977d9be64' 
  AND token = 'o8Y+IyqIgez8KPMhLf/+O4zm0BEDINl7R4vPWFtKLqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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