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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b21540dbc4e4c391aaf4de9975731b0730b8b2b29619a79584244653e4df88e' 
  AND token = 'etw0ggjw632b7PXbTt4+3dZd0wArlK57TmMEtJboOZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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