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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bfe41d071cfde8cb1d0088e8d3c77be7ac703076dbf2904bdcca80b796045df' 
  AND token = '7kOkjgyvX5/OpGGmuMbKTyhyl46ZXOKD3OCG8NFbhDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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