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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e56e0a7d455b8311e6332d3ab8b794556b9beb42981bcc3c288f26619bd71f' 
  AND token = 'GPfSiZ7oAwZ2CfpehGmcHei4FBMkHws8GjJp+14nWWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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