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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4841a63ff273c404976457d1c352ec0358146ea45852cba8e37d4a663b5f084' 
  AND token = '9LnpNt1oBtrh1BXJmAvmuooenzAKjMIU/gAmFrcSgWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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