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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08d7fcd956655b408de55e28a00e8247c11fee94d993c4533e2a0045095fdf2' 
  AND token = 'wS7PQv+OLuQS3Um5SLZDgWCdd83WbQ/pWRtDElAVc1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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