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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f66506cdf96526a28fdc748edfdd486e9dc7d509654807217441a9f6e358472' 
  AND token = 'eg+kU5mtPZnHzXtmvDr2D+eyGWt9Ic7yqi92XOFU/zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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