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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '561a56424f241f17c8d1bae1021ab6af69a54fd250edf0ffb4e13c9ce0735a8d' 
  AND token = 'hmCDgxXFY8RQmcDG5YdxRMYUgqy9LWfkLeCfHKuWUzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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