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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb52ce96cfcedbb6968653027cca030582aab8486a546eebaf30f4f55cab6afc' 
  AND token = 'qrFSOIykIHh/Ja7DcMvtWV0uwPPSyPw0eHfGqn3bRCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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