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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '320971af00e255c4a50777cf27d211139cbd101ab8d70274c15336026c26b932' 
  AND token = 'ORY+YW1RFvy81mPzjdMh4nr0vHFsPbLoH6bPvrTIWfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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