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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dccc923ab87850b5a57a2ad1790f1c4f308db2cbd9b4dbe07e7dad47a87f7a83' 
  AND token = 'CpgWggfzNjHfrTSacU3ROwVEJKezF2G3eHtNDxvlbEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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