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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0454c82a63893953c7c32a96f8dabf49706eee44aaf827d657681846a51d5d1f' 
  AND token = 'C/Nob25C0QVpENOqg4B7uKe9ANRnYbbVXlq/t7MDHBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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