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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b5c7e68a8bfaa6daba141dda41e9a189278df65c54056f5aea65992a55fa9f' 
  AND token = '26jQtr9b4laJAO6qtk2276S1AiXiygeaxodrFSRP6L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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