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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f830a7f65bd8e68d7a879c7f6197dba7e3b017a70eb6ea0b6061bc136ff5dce' 
  AND token = 'CNWpunthCuvcKhbEtp5Ublgft0kKDlbk48QBBYV2/kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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