SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '772554d2bd822ea14753e68c268e56a98ce5c3a52df5f1a6e6d375a56a19b812' 
  AND token = 'mwtClTqxl4SSNOZFh4o1Y9MDs/dg3tBYgWG/RTj8X9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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