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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab08c662bb47375e3c3f1397a695be3b8192325f925272d2ebe632ce84bfd00' 
  AND token = 'jdXZ6vWEU6fXA9+BmqUc8LgqPbMzVn8Uk+s3edOX5ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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