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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7299efb6eb53d243576f224a20006fe4250e94afbd82721c943ad7fd310e5b2b' 
  AND token = '5+3wkruXWRE3iuIZZePw2iRCAUu9/1hCQL9pwUY9ZQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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