SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e65bf514823047e1932d386799ca813312726fbe06306cc292e5d3e2fa94f6c4' 
  AND token = 'AhYdh5q2ezMjUCbOLvvpZftVRO+8rOVTP5vrbytOqMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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