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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a8e98bec8e879f6c2cb8a60500b17b588964e0670efe03b2717d7be5740705' 
  AND token = 'V8CRlRUZBysZYXHVEWQmfu0QOvR5VfxHtc+tybD5RSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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