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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3c6a996566f9ca96bff414e5ba878cfe7ced3ecbd5c81499a49a57a3cfcb1b' 
  AND token = 'xPFwagG3RXWMZwxBOdnoBnzR+jtyM80O+1bVOGIhUwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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