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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b786610e016b0705b53432152f3f1275fc71b0c103ab5aaacd6fb945913074' 
  AND token = 'VuwWM7ken9u9H+3XGPjXAqQ22TE8TsvzoMGtuu7VVjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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