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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6260ad14284acab32006d8668299b5947f8f4a693cd086a574daf2e79cb61e7a' 
  AND token = 'SEM0aPAGDeWBPZESz/lpABt+eodl83hvNsPUg0H7T90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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