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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce1c301d57c5f9d6af39cb5fae0ccabe2013e71099f769272e2b81e34ed54e6' 
  AND token = '808BbaRORsH0eSjJdIjSVob00eP2F6Cid/w7J9LewsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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