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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0b896e6cb16a9c2761e98eaf39a7ae79360fc39431391961a4337e55b0cd06' 
  AND token = 'CjRmHlVooXoKf0GpAEa16Y/Yg1mztBm2OL7n25wmQZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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