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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cdeb9ce5e36ef6bd0d534fd4e74640118c5fe835be0e896e706ced0ae4cc2fc' 
  AND token = 'SKFF5YZFB7H8gtQm0oPMgQtnsmErxrm4fjnFFLzTLvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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