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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff1cfa8cdd5d9f1f4fcb611eb6cecb582038017a74a04276e1e1be163fa0c23f' 
  AND token = 'i7RqvlHZx8wqkkzZLOeJ7u9Rst3H6hVL7Pu++0M9+A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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