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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e71c520275502a4af505f4077a87a2ea981a8e4f3d1eb19f59037e3e859e03' 
  AND token = 'yuu0jAJLCbD5mi2G1xblbMo1CVpFH9cHdwCx3iBpMig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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