SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f411b90c0ebd78afa5105f39c5046869a880440fdf6b9a2dfd2bba859b23f710' 
  AND token = 'guZ6JSvyAnwDPtQ4n0KnZrRrltCVogZjCd4q5132MBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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