SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e63019db7c2ccaf0f69ed597cf345ce69402d4413e80ef0771158bfa855ceb84' 
  AND token = 'r3TGZI253yolUoKySPlLjZgs8jtvz/nzl7XHxFjmhf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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