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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '769f06daabd269f5b4e24c25b2b183e1118f054bbdf99f0078735d35ab8c86df' 
  AND token = 'HY3Bd5DTwyiyhzk1x498KSQjqWmbiG6zIS4O76MAMfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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