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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee71298f0c75ab5b76fa9c25ae587c818b966abdc378ff747a8589c78f21401' 
  AND token = '7YY4K9FYIurtMY9PTxTdPRpnkYb0nIwT+Kil8PcbRMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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