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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aafca6bb7d2fefab6fc8cf2844cf29547d26dc8f3eb326a584a89a21ba0a6da' 
  AND token = 'JFGxaJqaNNZsGKK/xScggXS3HJibf3Hv1w+y0kbJIlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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