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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7daa93d2cf98daeaa41ad29276088c432b93b4952d3c8b5a693eab59f67141c' 
  AND token = 'E9NVpGh46kr0MrHImMNZ8sSVsZMY/WeVlR+7yEbVGgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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