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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f621ab776d63058c3691c861a42560b219504d5e63768d6dd460725aa0c2d5c' 
  AND token = 'sHXIVG8aUkvvT+pJzalrMczd4kYgWHFI0vl50fI+7nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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