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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77636ca41e7ff0aee8570c8fc51232d71372959fd10dc6e1650d364996fe82ee' 
  AND token = '4Rxin8SHiK2JovZHWyde3O0Wj6cBoNu5DPcEaTbMuiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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