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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d6d40189cba424a3b56fd1f6843a3a2490fc65aaf3777cbaa5a6c6e515583b' 
  AND token = 'WI+KvJ1uTZdI8PzeoIXzxUh2yQBPe7TaUCYW0MlletM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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