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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3397d36a9f734335e9cfcaf93f00ea6be0a6c26e00f8fa1f6fc11536e3ffe59b' 
  AND token = 'xMtNx0dO0zFVYh1XaER4ZdeKhvMtNcFmM7HcN4c4aPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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