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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ff59974b952100381a146874c0ad92c63c12adb14a253059bad72ca81713017' 
  AND token = '1EeDpKebGoVLNAwMTyhZJ0edmV7PZqSnM/K2Up6HSuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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