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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ce33364179166bcb6cc3cb763e005ed73d8ac218b222060004df89e98b79588' 
  AND token = '5Z0l5NNOEMA+fh2Q23Se5jt9tsC8S94iqyr341QkgQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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