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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '851d9848f8b2e42d98396700f8cb7000d3cc729a85c2ad9cd1bdcbf1770f8ea5' 
  AND token = 'dVFs8on2oMTVc9gZxuo3HRG9CbzgSQiHSUiIHccsS34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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