SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba11d64f27211146b3668999635debe965669cf2b72716224773fb1a9ffbb49' 
  AND token = 'rtbC8J9P3rwuwzGoNBZrSKH0B0jT4Vu4q7OdpL9/vFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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