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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '230ecd7ef52c583febf7ab5c4cbeaf31be2e1fce5328d83f6a20739ddc9a17dd' 
  AND token = '0GTE/yoDLT6fMhvb+m12EPzH93fXvOOkk4qwUYDR0RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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