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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f12a9987f7ef19a54e76104b42e07dfd9768c4c0b6d42c5d98cd7291f8306fe6' 
  AND token = '3l73pd1xMqKmo0OTuPaq2gijlZkbKb0MNDpt3GY4w/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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