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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daffbfcf0e56b441ce118fa0576dd9177e1eab59826ec669d59e38461bbc5be8' 
  AND token = 'ajLaQEGlma9Falnlh8V72MQwXFwJKchTfD6gpLCKhac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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