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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac884b7482374019d8f53cfc783e317baf5c573d7ca63253e3ef417f4d4efc4' 
  AND token = 'QrfGxhxi95U67/Ltj1WmAslx+/LM3RV6pl6PA433cEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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