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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7dd08cc1d8e1a046b4b68e961b2e350dff622b921b335bc790fea16ebae25f7' 
  AND token = 'uEeQ272cyOodeQziEG5DiE5TxpIlznbWh5JfHDTLoG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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