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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f17fe56ca9ac1bb68f10cc0e9f45605190dd4c53cef7862655c1f6fc5e0eb0' 
  AND token = '/XY0cTO4xeKxHgjNQSmrzP0GpKtynP13NwdspSGvPDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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