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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c6fd5e3c32a72e70fcbe81aca367bee400fa0795324eb7e8a97acf191b756f' 
  AND token = 'xdcyo3B/D89xBhplA9HaAtN0C5yYYrStRTJNs4ftEkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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