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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b203c1ecbbec5eda28338ff27bacef5aa39ba6f59819cb5f1322704eae4f830' 
  AND token = '9oVD+siDaDGutIG9dKTGyi5/Y8BlHfAwbXP7KIFsn2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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