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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27a17d677b170c21b346ceaa7f89203e5ee4153de58506e0055425326ff92a35' 
  AND token = 'gykf8EXFizGBgdhXW4iTjs5tlh4r9/rT7P7ft4Mbkmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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