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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d2c3ff76b3ff101dfcbc3efaa0cbc29617fb013a4ed1201939ecfbf9d24a43' 
  AND token = '2jaDWp4f0GN1+u93MJC7rO1BhQlVLYKJTU+0mNq2N/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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