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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57fcc1b829055ec8c8e94620a0ae0fe81a11c6b9dde0d9b6f6f721a3ed83000' 
  AND token = '3EXfoV2T+dJn7yELlVQIJSafUgZPkc5V9XN15N4RvhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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