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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8f4c815845781c237fceb97d753089ed0e357cb476c0ca07c0c96e73fba8b3' 
  AND token = 'W7kOut3zS97g+1HdC5rhTGiowd5+fdMmZLTc4ON/roA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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