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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d95ca4e77a46b9c11695748fd3acce07d6606e93f0ce1512b81351c76c59eae' 
  AND token = 'Ni6LaNk6Cz20ZoG71GuQ8XaVTBXPVRUIMC20T9TrKJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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