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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b6615e075dd234e5c4e7d2e654a2cc3ca354d59f5c15237510739fd3ce8089f' 
  AND token = '8JWl6wwT4j8xea1bhbRpVRP5kUjurbwwsv7i72N6Rfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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