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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eb65701e7f454fc7ad67443957fc73fe6a080d19065d669004e3934a4daa27d' 
  AND token = 'BtCJ7EpVdJS9RI1aV75Y0HLexi/aWMSrXjPZKoxeoos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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