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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f67be501e0a8a08a97db60c6552b5ed82d9dd86c3bb72ef3da2f712dbfacf29a' 
  AND token = 'FznOZL5sTf6WJwZ7F7r3HuNLpqORr8hPz3vCxzaaKb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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