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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3118ee0cb4048202bc4708199a3dcf82f54fbbef3337769266fef4d2adb6d03f' 
  AND token = 'x7+sx8WDzTfov98syv/iyrNazhiHOV1CQ/2t8wyaxIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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