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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf832360f9ea6c06141c917b0e209ce398e54b67a7cbc63c285d971622bf9fa' 
  AND token = 'sweu/IjatTFC1ZUcWaUBEbOxvKzkwwXAqWbYpMFAtiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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