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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16ed5c46ad2a7fc45c54335ba3b8b4085d9f2cfeaf0a65abb6927460f36a2634' 
  AND token = '95o1GxBRL4H9DvgLKwgNENWYXeGBNN6GnrBd/bditgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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