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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9075a7ece3711ed4288d4580d6b34b11de600aa2ed41115e22253fca9036cdc9' 
  AND token = 'AQrkOCKWMrSbvOncmYXWqe1AUiJqoNWxGPTQCvblO2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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