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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab5cb40de8fb2f9ecc1ead6a577bb598a7c80809b51453bc7441569a4f24e21' 
  AND token = 'wFGd44e4+R73izfEn+XeFKnJXBzhiLIyfrauJk+twGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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