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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87df1cb27a2b8e4c6d51409b47a11087773f218903d903e0e061b41ca442e98' 
  AND token = 'QietP0QMeW92t6pHV/uTdDSGwBoRsZsGbqPYX/oRmw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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